With US President Barack Obama's left arm over her shoulders, and a camera pointed their way, Madalyn Starkey had seconds to figure out how she wanted the moment captured.
She put on an aghast expression and pointed a finger at the President as she posed for her Australian boyfriend, James Healey, who was filming on his camera phone.
"I'm not going to stand there with a smile and my lips all quivering," she told CBS Denver.
"Of course I'm going to throw my excitement out there in a picture."
A snap and a tweet later, the photo went viral. It garnered more than 1000 retweets and Facebook likes in less than a day.
Just met Obama at the Sink.instagr.am/p/J0qd80H9qW/— Madalyn Starkey (@Madloid55) April 25, 2012
"I was going to send it to my parents as a joke and whatnot and then I posted it on Twitter thinking that my friends would see it. But no, now the nation is seeing it," she said.
The University of Colorado student was with friends at a popular university student hangout called the Sink, in Boulder, Colorado, on Tuesday evening.
Moments after their drinks landed on their table, security walked in, saying: "Attention, attention, if you don't want to meet the President, leave. If you do want to meet him, then come to this backroom."
Mr Obama made a surprise pit stop for dinner before heading to a nearby events centre to make a speech.
After being scanned by security, Ms Starkey got to make her pose with the President.
"It's going kind of viral at the moment. It's the most ridiculous thing; I would never have expected it," she said.
It's going kind of viral at the moment. It's the most ridiculous thing; I would never have expected it
Woooo, never knew a tweet could blow up like that. Neat!— Madalyn Starkey (@Madloid55) April 25, 2012
The owners of the Sink got less than 20 minutes notice about the President's visit. They have changed the name of the pepperoni, sausage, green pepper, black olive and onion pizza he ordered to POTUS Pie. (POTUS is an acronym for President of the United States.)
"When the President orders it, he can have the name," Mark Heinritz, owner of the Sink, told a local news crew.
Mr Obama also took a snap with the staff and signed his name on the wall at the Sink.
This week, Mr Obama appeared on comedian Jimmy Fallon's late-night talk show.
The President crooned a speech on student loans to the backing of Fallon's house band, the Roots.
The show was held at the University of North Carolina, whose students were ecstatic over Mr Obama's appearance.